Custom Error Class

 A CLASS IS CREATED THAT EXTENDS THE ERROR CLASS .(IN ANOTHER FILE MyError.js)

class MyError extends Error {

  constructor(status, message) {

    super();

    this.status = status;

    this.message = message;

  }

}

module.exports = MyError;

IT IS REQUIRED IN APP.JS

const MyError = require("./MyError");

const checkToken = (req, res, next) => {

  let { token } = req.query;

  if (token === "giveaccess") {

    next();

  }

  // throw new Error("ACCESS DENIED");

  throw new MyError(401, "ACCESS DENIED");

};

app.use((err, req, res, next) => {

  console.log("-----ERROR------");

  res.send(err)

});